摘要: 为了避免低温灾害对农作物的生长繁殖一级农业经济的破坏,就需要设计一种低温灾害温度的监测系统。利用无线监测技术实时的采集气候信息，系统能及时监测到低温灾害温度并进行预警，对农作物持续稳定生长，提高农业经济效益和农村经济的发展具有重要的现实意义和使用价值。34406
通过对温度监测系统的研究，设计了以STC89C51型单片机作为主控制器件，采用nRF24L01作为无线通信模块，DS18B20 数字温度传感器为测温元件，HJ1602A为温度显示器并设有低温报警功能的智能温度检测系统。设计内容两部分，即硬件设计和软件设计，本设计具有读数方便，测温范围广，低温预警，测温精确，数字显示，应用范围宽等效果。
毕业论文关键词: STC89C51   nRF24L01   DS18B20  HJ1602A
Low temperature disaster temperature monitoring system design
Abstract:With the development of society, the degree of China's modernization is constantly improving, the development of China's agriculture must take the road of modern agriculture, the number has become the trend of modern agricultural development. In order to avoid the damage of agricultural economy at the growth and reproduction of crops, the monitoring system of the low temperature disaster temperature is needed.. Crops sustained and stable growth, improve the economy benefit of the agriculture and the rural economy development has important practical significance and use value of the use of wireless monitoring technology to real-time acquisition of climate information, the system can monitor temperature of low temperature disaster and warning.
Through the study of temperature monitoring system design STC89C51 MCU as the main control device and nRF24L01 as the wireless communication module, digital temperature sensor DS18B20 as a temperature sensor, HJ1602A for temperature display and a low temperature alarm function of intelligent temperature detection system. The design content of two parts, namely hardware design and software design, this design has reading convenience, the temperature measurement range is wide, the low temperature early warning, the temperature measurement is accurate, the digital display, the application range is wide and so on.
 Keywords: nRF24L01 DS18B20 HJ1602A STC89C51
目录
1 绪论    5
1.1课题的来源与背景    5
1.2国内外研究现状与水平    5
1.3课题的目的与意义    6
1.4 课题的基本内容    7
2 系统设计方案    8
2.1硬件选择方案    8
2.1.1主控芯片的选择    8
2.1.2电源电路的选择    8
2.1.3无线收发模块的选择    9
2.1.4温度传感器的选择    9
2.1.5本系统的显示方案    9
2.2系统总设计框图    10
3 系统的硬件设计    12
3.1单片机的系统设计    12
3.1.1单片机最小系统设计    12
3.1.2单片机的选择    13
3.2 无线通信模块的设计    15
3.2.1 nRF24L01的设计    15
3.2.2无线通信模块的选择    16
3.2.3功能描述    18
3.3温度传感器的设计    21
3.3.1 DS18B20系统的设计    21
3.3.2温度传感器的选择    22
3.3.3测温原理    23
3.3.4测温操作    24
3.4 电源电路设计    27
3.5 系统电源模块的设计    27
3.6 LCD显示屏的设计    28
3.6.1引脚功能    29
3.6.2操作流程    29 STC89C51单片机低温灾害温度监测系统设计+程序:http://www.youerw.com/zidonghua/lunwen_31893.html